Water-heating system



Aug. 7, 1928. 1,680,014

. F. F. DALE ET AL Y WATER HEATING SYSTEM Fiied Aug.1s, 1925 F I Ell Y 5 afented Aug.` 1.928.

v UNITED STATES `miniers 'rennen DALE `Ann IAN' PATENT oFF'IcE WALTER GRAGE; or MARTINBOROUGH; NEW

ZEALAND.

'WATER-HEATING SYSTEM'.

e Application niean'u'gust 13, 1925, seriai No. 50,098, and in New zealand november a, 1924.

This inventionlrelates tofhot'water systems, and its Objectis to provide an improved system, wherein cold water is prevented from mixing with the already heated 1 f5 water, thereby ensuring that the complete contents of the hot water storage cylinder may be utilized without thetemperature of said contents being reduced by the admission of cold water to said cylinder-V y T heaimproved systemcomprises a water supply tank, .a hot water storage cylinder, anda heater,` in communication with each other,r ythe chief feature of the invention being the arrangement of the pipe which delivers `1.5 het water ,from the heater to the storage cyl-V inder so lthat said pipe rises toa point above Y the water level in said supply tank and the radiation of heatin the bottom of the storage cylinder. r i

Other features of theinvention are the drawing off of the hotwater from the bot-- tom of the storage cylinder,instead of from the top thereof,the delivery of; water from Athe supply tank, to thejheater direct, in-

l 125` stead of tojthe storagercylinder, andthe circulation of water from the storage cylinder Lthrough the supply tank and heater, and

back to the storage cylinder.. u

Y The invention will be more particularly described in conjunction withv the accompanying drawing, which illustrates diagrammatically several formsof apparatus, Y, embodying the invention. -J r Q Figures 1and 2 are vertical sections il- 85 'lustrating the improved system as provided i with anelectric heaten Figure 3 vis avertical section of a system `with a boiler of a `stove orfurnace usedV for heating the water, .f

. Figure 4 .shows in vertical` section, howan electric heater and a boiler maybe Iused simultaneously in series, or each independtly of theother, and l liigureV 5` is a sectional fragment, ,parts being in elevation-illustrating amodification i vapplicable to theform shown in Figure 2.

Referring to Figure l, the yhot water stor- .age cylinder 1, has the heater 2 fitted in the bottom thereof, said heater, comprising a i hollow fitting 2', in `which is installed an electrical heating element 3 preferably of the immersion heatertype. Q: s

. The 'water supply Vtank 4,`which.1s provided with the usual lball cock for controlling the admission of water thereto, and also the cylinder 1, the water in thelatter will -with the usual overiow, is 'placedfzconveni the ,heating element 3.

A pipe 7 .extends upwards in the-storage j cylinder 1, from the top ofthe heater 2 to above the level of the water inthe supply tankl-.MV

A pipe 8 connects the upper end of thecylinder 1,- with the'supply tank lasaid pipev i 8 being located below .the highest point ofV the pipe 7 andv above the highest water'level obtaining in the tank 4f. v to atmosphere and serves as' a vent.

Y With no water in the cylinder l, and wit Water in the pipe 7 land tank 4L -to the level This pipe 8 isopen indicated inthe latter, and with the .heater in operation the action is as follows The water in the heater 2 is heated and .expands or rises in the latter, and in the fpipe 7,.until it finally on reaching the boiling point passes over the upper end of the pipe 7 into the cylinder 1. This action con`,

,tin-ues until the, cylinder 1 fills to the level.l `of the pipe8, and should no water :be drawn oif from the storage cylinder 1, through the pipe 9 which leads `from the bottom iof ultimately overflow from the Vcylinder l, via the vent pipe 8, to the tank 4;, causing circulation to beset upthrough the latter, the pipe -5, heater 2 and 'pipe 7 back to the cylinder l. Y l Y u The whole of the contentsjof the cylinder 1 can be drawn olf via the pipe y9, Vwithout the tem erature` of said Vcontents being loweredvv y the admission ofcold `water to replacejthat drawn off, as water can yonly venter thecylinder "1, byA being heated .tol a degree suiiicient to cause it to pass Vover 'the upper end of thepipe 7, and there is not therefore, at any time any admission of cold water tothe cylinder 1.. Y 'p Furthenthe provisionl of thehollow fit ting2a, containing 'the heating' element 3, .in the bottomofthe cylinder 1, not only yeprovides for the heating ofwater in-,said iitting 2a, but the latter in turn, becomes heated, ,105,

' to cool off, assisting to re-heat the' water in the cylinder 1,although'the quickest way to obtain hot water in the cylinder lis to run off the cold water via tliepipel 9, and allov v the cylinder l to refill with water from thel i e 7. p 1in the form shown in Figure 2, the electric heater 2 is located externally of the cylinder 1*,-the'pipe'7`iisingto a point abovethe level of water in the tank 4L, and passing downwards in the said cylinderto nearfthe bottom thereof.

Inl this case there is no radiation of heat in the cylinder l, from the heater 2, 'such radiation being however, effected in the bottom of the cylinder l, by the discharge thereinto near the bottom, from v'the pipe 7, of

"the hot 4water fromtlie heater 2. Otherwise kthe operation of the system illustrated in Figure 2 is similar to that illustrated inV Figure vl.

f The formfshown in Figure 3 corresponds j with that'sliownin 4Figure l, except that the electric heating element 3 is dispensed with,

a boiler 10 adapted to be used in' conjunction with any suitable form of stove or furnace, being used in place thereof, the `water passing from the supply tank 4,' via the pipe 5 to the boiler 10-where it -is heated, from'the latter via the pipe 10a, hollow fitting 2f?, and pipe?, to the cylinder l, the hollow fitting '2a being retained because Vofthe increased 'heat-ing surface it provides, to effect the] radiation of heat in the vinder 1. l i

Inthe last described form, it is possible by providing a drawv ofi1 cock 11' in the pipe bottom of the cyl- 10 as close as possible to the boiler l() to obtain hot water from the latter, within a short time of starting the-fire, in the furnace or stove in which the boiler 10 is fitted.

As shown v'in-Figure 4, an elecricf'heater 2.,l and a boiler 107m'ay be included in the one system, and connected in series so that they may be used simultaneously o rv each-independently of'the other, as desired. In this "form -thepipe l0 passes water from the *boiler 10 to the electric heater 2.v l

'In the modification shown iny Figure 5.

Also it ispossible to utilize more than one boiler-10 in any one system in which case said boi-1ers would be--connected up' in parallel.- f f i andas. applied to the form illustrated in Figure 2, vthe vent pipe 8 can be ofgreater diameterthan'lthepi-pe 7 the latter passing *downwards in the lcylinder l?, to knear ther 'bottom thereof, through the 'vent pipe 8,

and being provided` Vwith an Aopening 7a, which eommunicates'with said vent-pipe, 8. v yHaving thus Adescribed our invention, we

f declare that what we 'claim-andydesire' to y obtainbyA Letters Patent ofthe` United *States- 'of America is y Y f 11A water heating system comprising, a f

' have its upper` end a circulation pipe affording. direct communiwater supply tank havin means for main- Y taining a'constant level t erein,aihot water storage cylinder, and a heater all in intereommunication, a hot water Vdelivery pipeV leading from the heater to the storage cylinder and rising to suoli point above the water `level in thesupply tank as will permit the column of water when heated by said heater to the predetermined degree for which said systeinis designed to overflow said delivery pipe into vsaid storage tank jand a' circulation pipe affording communication between a hot water storage cylinder and lthe supply tank above the level of water in the'latter,yfor renabling water to circulate from the storag'ef cylinder .through the supply tankl and Vthe heater 'and back to the storage cylinder when Vtlie latter is filled to the level-Ofrsaid 'ein Cllllblllg i., v A

2.V` A water'heating system, comprising, a water supplytank having means for autormatically maintaining a constant level, therein, awater storage cylinder, and an electrically Voperatedy heater located inthe bottom of the storage cylinder, all in intercomniunication, ahot water delivery pipeleading from the heater to and rising within the storage cylinder tov such a point above the water level in the supply tank as' will ermit the column of waterv when heatedl to t e -predetermined degree for which said system Vis designed to overiiow said" delivery pipe into said storage tank, the heightof said delivery pipe being such as to have its upper end above the constant level maintained within the supply tank.- i

ing from the heater to and rising within the storage cylinder, to vsuch va pointabove the water level in the supply tankfas will permit the column of water when heated tothe predetermined ldegree for which said system is designed to overflow saiddelivery pipeinto said storage tank, the height of saidl firstmentioned Vdelivery ipe being vsuchV as Vto, bove the constant level maintained within the supply tank,"fa second waterdelivery pipe leading from'thesupply tank .directlyV to: the heater andr a. hot waterl draw'off pipe leading froI-nthepbot-` tom of the storage'cylinderx v i 4. Alwater heatingsystemas set .forth in claim 2, comprising, -a combined! vent land cationbetween the storage `cylinder andthe supply tankfand locatedbetween thehighest I n point ofthe hot water delivery pipe and the water level in the supply tank, forenabling water to-'circulate from the .storagel'cylin-*1 i pipe.

der through the supply tank and the heater and back to the storage cylinder when the latter is filled to the level of said circulation `5. A Water heating system accordin to claim 3,'co1nprising a combined vent an circulation pipe all'ording a communication between the storage cylinder and the supply tank and located between the highest point 10 of the rst mentioned hot water delivery pipe and the Water level in the supply tank,

forenabling Water to circulate from the Stora e cylinder through the supply tank and t e-heater and back to thevstorage cylineder when the latter is filled to the level of said circulatlon plpe.

Y In testimony whereof We have signed our n names to this -specification.

' FERRIS FARRAR DALE.

IAN WALTER GRACE. 

